Patents by Inventor Robert Gradwohl

Robert Gradwohl has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Rectangular doormat
    Patent number: D460310
    Type: Grant
    Filed: May 29, 2001
    Date of Patent: July 16, 2002
    Inventor: Robert Gradwohl
  • Semicircular doormat
    Patent number: D469997
    Type: Grant
    Filed: May 29, 2001
    Date of Patent: February 11, 2003
    Inventor: Robert Gradwohl
  • Doormat
    Patent number: D413221
    Type: Grant
    Filed: November 24, 1998
    Date of Patent: August 31, 1999
    Assignee: Gradwohl Homeworks, L.L.C.
    Inventor: Robert Gradwohl